/*
 * jQuery Highlight plugin
 *
 * Based on highlight v3 by Johann Burkard
 * http://johannburkard.de/blog/programming/javascript/highlight-javascript-text-higlighting-jquery-plugin.html
 *
 * Code a little bit refactored and cleaned (in my humble opinion).
 * Most important changes:
 *  - has an option to highlight only entire words only (wordsOnly - false by default),
 *  - has an option to be case sensitive (caseSensitive - false by default)
 *  - highlight element tag and class names can be specified in options
 *
 * Usage:
 *   // wrap every occurrance of text 'lorem' in content
 *   // with <span class='highlight'> (default options)
 *   $('#content').highlight('lorem');
 *
 *   // search for and highlight more terms at once
 *   // so you can save some time on traversing DOM
 *   $('#content').highlight(['lorem', 'ipsum']);
 *   $('#content').highlight('lorem ipsum');
 *
 *   // search only for entire word 'lorem'
 *   $('#content').highlight('lorem', { wordsOnly: true });
 *
 *   // don't ignore case during search of term 'lorem'
 *   $('#content').highlight('lorem', { caseSensitive: true });
 *
 *   // wrap every occurrance of term 'ipsum' in content
 *   // with <em class='important'>
 *   $('#content').highlight('ipsum', { element: 'em', className: 'important' });
 *
 *   // remove default highlight
 *   $('#content').unhighlight();
 *
 *   // remove custom highlight
 *   $('#content').unhighlight({ element: 'em', className: 'important' });
 *
 *
 * Copyright (c) 2009 Bartek Szopka
 *
 * Licensed under MIT license.
 *
 */

jQuery.extend({
    highlight: function (node, re, nodeName, className) {
		try {
			if (node.nodeType === 3) {
				var match = node.data.match(re);
				if (match) {
					var highlight = document.createElement(nodeName || 'span');
					highlight.className = className || 'highlight';
					var wordNode = node.splitText(match.index);
					wordNode.splitText(match[0].length);
					var wordClone = wordNode.cloneNode(true);
					highlight.appendChild(wordClone);
					wordNode.parentNode.replaceChild(highlight, wordNode);
					return 1; //skip added node in parent
				}
			}
			else 
				if ((node.nodeType === 1 && node.childNodes) && // only element nodes that have children
				!/(script|style)/i.test(node.tagName) && // ignore script and style nodes
				!(node.tagName === nodeName.toUpperCase() && node.className === className)) { // skip if already highlighted
					for (var i = 0; i < node.childNodes.length; i++) {
						i += jQuery.highlight(node.childNodes[i], re, nodeName, className);
					}
				}
			return 0;
		}
		catch (e)
		{
			// do nothing
		}
    }
});

jQuery.fn.unhighlight = function (options) {
	try {
		var settings = {
			className: 'highlight',
			element: 'span'
		};
		jQuery.extend(settings, options);
		
		return this.find(settings.element + "." + settings.className).each(function(){
			var parent = this.parentNode;
			parent.replaceChild(this.firstChild, this);
			parent.normalize();
		}).end();
	}
	catch (e)
	{
		// do nothing
	}
};

jQuery.fn.highlight = function (words, options) {
	try {
		var settings = {
			className: 'highlight',
			element: 'span',
			caseSensitive: false,
			wordsOnly: false
		};
		jQuery.extend(settings, options);
		
		if (words.constructor === String) {
			words = [words];
		}
		
		var flag = settings.caseSensitive ? "" : "i";
		var pattern = "(" + words.join("|") + ")";
		if (settings.wordsOnly) {
			pattern = "\\b" + pattern + "\\b";
		}
		var re = new RegExp(pattern, flag);
		
		return this.each(function(){
			jQuery.highlight(this, re, settings.element, settings.className);
		});
	}
	catch (e)
	{
		// do nothing
	}
};

